Facebook plans to test a Groupon-like service on its social network to link its users up to local discounts.
The privately held company said it would initially roll out the service to Dallas, Austin, Atlanta, San Francisco and San Diego.
Such a move will plump up Facebook's current Deals offering via its creepy Places service …

And Yelp

...just started doing the same, another "natural fit." I never understood why Google was willing to pay so much for Groupon, and even less why Groupon turned them down. It's the tech boom all over again.